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  • 型号: UC3902D
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ICGOO电子元器件商城为您提供UC3902D由Texas Instruments设计生产,在icgoo商城现货销售,并且可以通过原厂、代理商等渠道进行代购。 UC3902D价格参考¥15.88-¥29.50。Texas InstrumentsUC3902D封装/规格:PMIC - 电源管理 - 专用, Load Share Controller PMIC 8-SOIC。您可以下载UC3902D参考资料、Datasheet数据手册功能说明书,资料中有UC3902D 详细功能的应用电路图电压和使用方法及教程。

产品参数 图文手册 常见问题
参数 数值
产品目录

集成电路 (IC)半导体

描述

IC LOAD SHARE CONTROLLER 8-SOIC专业电源管理 LOAD SHARE CONTROLLER

产品分类

PMIC - 电源管理 - 专用

品牌

Texas Instruments

产品手册

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产品图片

rohs

符合RoHS无铅 / 符合限制有害物质指令(RoHS)规范要求

产品系列

电源管理 IC,专业电源管理,Texas Instruments UC3902D-

数据手册

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产品型号

UC3902D

产品目录页面

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产品种类

专业电源管理

供应商器件封装

8-SOIC

其它名称

296-11340-5

包装

管件

单位重量

72.600 mg

商标

Texas Instruments

安装类型

表面贴装

安装风格

SMD/SMT

封装

Tube

封装/外壳

8-SOIC(0.154",3.90mm 宽)

封装/箱体

SOIC-8

工作温度

0°C ~ 70°C

工作温度范围

0 C to + 70 C

工厂包装数量

75

应用

负荷分载控制器

标准包装

75

电压-电源

2.7 V ~ 20 V

电流-电源

4mA

电源电压

2.7 V to 20 V

电源电流

6 mA

类型

Load Share Controllers

系列

UC3902

输入电压范围

2.7 V to 20 V

输出电流

150 uA

配用

/product-detail/zh/UCC39002EVM/296-19045-ND/863866

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UC2902 UC3902 SLUS232E − DECEMBER 19, 2002 − REVISED JULY 2011 LOAD SHARE CONTROLLER FEATURES DESCRIPTION (cid:2) 2.7-V to 20-V Operation The UC3902 load share controller is an 8-pin (cid:2) 8-Pin Package device that balances the current drawn from (cid:2) Requires Minimum Number of External independent, paralleled power supplies. Load Components sharing is accomplished by adjusting each (cid:2) supplies’ output current to a level proportional to Compatible with Existing Power Supply the voltage on a share bus. Designs Incorporating Remote Output Voltage Sensin The master power supply, which is automatically (cid:2) Differential Share Bus designated as the supply that regulates to the (cid:2) highest voltage, drives the share bus with a Precision Current Sense Amplifier (40 Gain) voltage proportional to its output current. The (cid:2) UVLO (Undervoltage Lockout) Circuitry UC3902 trims the output voltage of the other (cid:2) User Programmable Share Loop paralleled supplies so that they each support their Compensation share of the load current. Typically, each supply is designed for the same current level although that APPLICATIONS is not necessary for use with the UC3902. By (cid:2) appropriately scaling the current sense resistor, Paralelled Power Supplies supplies with different output current capability can be paralleled with each supply providing the same percentage of their output current capability for a particular load. GND 1 8 VCC BIAS UVLO − SHARE DRIVE AMPLIFIER + 40R R SENSE 2 − 7 SHARE+ + + CURRENT SENSE SHARE SENSE AMPLIFIER AMPLIFIER − 6 SHARE− ERROR AMPLIFIER + ADJ 3 0.6 V 35 mV + − ADJ AMPLIFIER + + 5 COMP − 2.3 V ADJR 4 UDG−01141 PRODUCTION DATA information is current as of publication date. Copyright © 2002 − 2008, Texas Instruments Incorporated Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. www.ti.com 1

UC2902 UC3902 SLUS232E − DECEMBER 19, 2002 − REVISED JULY 2011 DESCRIPTION (continued) A differential line is used for the share bus to maximize noise immunity and accommodate different voltage drops in each power converter’s ground return line. Trimming of each converter’s output voltage is accomplished by injecting a small current into the output voltage sense line, which requires a small resistance (typically 20 Ω to 100 Ω) to be inserted. These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. ABSOLUTE MAXIMUM RATINGS over operating free-air temperature range unless otherwise noted(1) UC2902 UNIT UC3902 VCC, ADJ −0.3 to 20 SENSE −5 to 5 IInnppuutt vvoollttaaggee rraannggee, VVI ADJR, COMP −0.3 to 4 VV SHARE−, SHARE+ −0.3 to 10 SHARE+ −100 mA to 10 mA mA OOuuttppuutt ccuurrrreenntt, IIO ADJ −1 mA to 30 mA mA Operating free-air temperature range, TA −40 to 100 Junction temperature range, TJ −55 to 105 °°CC Storage temperature, Tstg −65 to 150 Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds 300 (1) Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. Voltages are with respect to GND. Currents are positive into, and negative out of the specified terminal. 2 www.ti.com

UC2902 UC3902 SLUS232E − DECEMBER 19, 2002 − REVISED JULY 2011 ELECTRICAL CHARACTERISTICS TJ = –40°C to 105°C, (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Power SUPPLY SUPPLY CURRENT SHARE+ = 1 V, SENSE = 0 V 4 6 IICC SSuuppppllyy ccuurrrreenntt VCC = 20 V 6 10 mmAA UNDERVOLTAGE LOCKOUT VCC Startup voltage SHARE+ = 0.2 V, SENSE = 0 V, COMP = 1 V 2.3 2.5 2.7 V Hysteresis SHARE+ = 0.2 V, SENSE = 0 V, COMP = 1 V 60 100 140 mV CURRENT SENSE AMPLIFIER VIO Input offset voltage 0.1 V ≤ V(SHARE+) ≤ 1.1 V −2.5 −0.5 1.5 mV SENSE to SHARE gain 0.1 V ≤ V(SHARE+) ≤ 1.1 V −41 −40 −39 V RIN Input resistance 0.6 1 1.5 V SHARE DRIVE AMPLIFIER VCC = 2.5 V V(SENSE) = −50 mV 1.2 1.4 I(SHARE+) = −1 mA VOH HSSHHigAAh-RRleEEv++el output voltage, VI(SCHCA =R E1+2) V= −1 mA V(SENSE) = −250 mV 9.6 10.0 10.4 V VCC = 20 V V(SENSE) = −250 mV 9.6 10.0 10.4 I(SHARE+) = −1 mA VCC = 2.5 V V(SENSE) = 10 mV 20 50 I(SHARE+) = −1 mA VOL Low-level output voltage, SHARE+ VI(SCHCA =R E1+2) V= −1 mA V(SENSE) = 10 mV 20 50 mmVV VCC = 20 V V(SENSE) = 10 mV 20 50 I(SHARE+) = −1 mA VO Output voltage, SHARE+ V(S(SHEANRSEE)+ = t o0 GmNVD, ) R(SHARE+) = 200 Ω 20 40 CMRR Common mode rejection ratio 0 V ≤ V(SHARE−) ≤ 1 V, 50 90 dB SENSE used as input to amplifier Load regulation Load on SHARE+, 1 mA ≤ ILOAD ≤ −20 mA 0 20 mV V(SENSE) = −25 mV ISC Short circuit current V(SHARE+) = 0 V, V(SENSE) = −25 mV −85 −50 −20 mA VR((SSEHNASREE)+ =) = 1 02 0m0V Ω t o ( S−H90A RmEV+ s ttoe pGND) 0.12 0.26 0.38 SSlleeww rraattee VV//μss RV((SSEHNASREE)+ =) = − 29000 m ΩV t(oS H10A RmEV+ s ttoe pGND) 0.12 0.26 0.38 www.ti.com 3

UC2902 UC3902 SLUS232E − DECEMBER 19, 2002 − REVISED JULY 2011 ELECTRICAL CHARACTERISTICS (continued) TJ = –40°C to 105°C, (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT SHARE SENSE AMPLIFIER V(SHARE+) = 1 V, V(SHARE−) = GND 8 15 V(SENSE) = 10 mV RRIN IInnppuutt iimmppeeddaannccee R(SHARE+) = 200 Ω (SHARE+ to GND) 8 15 kkΩΩ V(SHARE−) = 1 V, V(SENSE) = 10 mV V(SHARE) Threshold voltage V(SENSE) = 0 V 41 70 100 mV CMRR Common mode rejection ratio 0 V ≤ V(SHARE−) ≤ 1 V, V(SENSE) = −2.5 mV 50 60 V(SENSE) = −2.5 mV, 5 nF capacitor from COMP to GND, 50 68 DDEESSCCRRIIPPTTIIOONN ffrroomm SSHHAARREE++ ttoo 1 kΩ resistor from ADJR to GND ddBB AAVVOOLL ADJR V(SENSE) = −2.5 mV, 5 nF capacitor from COMP to GND, 50 66 150 Ω resistor from ADJR to GND V(SHARE+) = 0 mV to 10 V step through a 200-Ω Slew rate resistor, R(COMP) = 500 Ω, 0.2 0.5 0.8 V/μs V(SENSE) = 10 mV, VCC = 10 V ERROR AMPLIFIER Transconductance, SHARE+ to gM COMP 200-Ω resistor SHARE+ to GND 3.0 4.5 6.0 mS IOH High-level output current VV((SCEONMSPE) )= = 1−.150 V m, V SHARE+ ≥ 300 mV −450 −325 −200 μAA 200-Ω resistor SHARE+ to GND, IOL Low-level output current V(COMP) = 1.5 V, V(SENSE) = 10 mV 80 150 250 VIO Input offset voltage 15 35 65 mV ΔΔVVI(OSE/NSE) 1−-2k.Ω5 mreVs i≤s tVor( SAEDNJSRE) t≤o −G2N5D mV −6 0 6 mV/V ADJ AMPLIFIER 200-Ω resistor SHARE+ to GND, ADJR low voltage −1 0 1 mV V(SENSE) = 10 mV ADJR high voltage V(SENSE) = 10 mV, V(SHARE+) = 1 V 1.4 1.8 2.1 V I(ADJR) = −0.5 mA, V(ADJ) = 2.5 V, 0.96 0.99 1.02 V(SENSE) = 10 mV, V(SHARE+) = 1 V I(ADJR) = −0.5 mA, V(ADJ) = 20 V, 0.96 0.99 1.02 V(SENSE) = 10 mV, V(SHARE+) = 1 V CCuurrrreenntt ggaaiinn AADDJJRR ttoo AADDJJ AA//AA I(ADJR) = −10 mA, V(ADJ) = 2.5 V, 0.96 0.99 1.02 V(SENSE) = 10 mV, V(SHARE+) = 1 V I(ADJR) = −10 mA, V(ADJ) = 20 V, 0.96 0.99 1.02 V(SENSE) = 10 mV, V(SHARE+) = 1 V 4 www.ti.com

UC2902 UC3902 SLUS232E − DECEMBER 19, 2002 − REVISED JULY 2011 ORDERING INFORMATION TA PACKAGE(2) PART NUMBER SOIC (D) UC2902D −4400°°CC ttoo 8855°°CC Plastic DIP (N) UC2902N SOIC (D) UC3902D 00°°CC ttoo 7700°°CC Plastic DIP (N) UC3902N (2) The D package is also available taped and reeled. Add an R suffix to the device type (i.e., bq24901DR) for quantities of 3,000 devices per reel. D PACKAGE N PACKAGE (TOP VIEW) (TOP VIEW) GND 1 8 VCC GND 1 8 VCC SENSE 2 7 SHARE+ SENSE 2 7 SHARE+ ADJ 3 6 SHARE− ADJ 3 6 SHARE− ADJR 4 5 COMP ADJR 4 5 COMP TERMINAL FUNCTIONS TERMINAL II//OO DDEESSCCRRIIPPTTIIOONN NAME NO. ADJ 3 I Current output of the adjust amplifier circuit (NPN collector) ADJR 4 O Current adjust amplifier range set (NPN emitter) COMP 5 I/O Output of the error amplifier, input of the adjust amplifier GND 1 − Local power supply return and signal ground SENSE 2 I Inverting input of the current sense amplifier SHARE+ 7 I/O Positive input from share bus or drive-to-share bus SHARE− 6 I Reference for SHARE+ pin VCC 8 I Local power supply (positive) www.ti.com 5

UC2902 UC3902 SLUS232E − DECEMBER 19, 2002 − REVISED JULY 2011 APPLICATION INFORMATION The values of five passive components must be determined to configure the UC3902 load share controller. The output and return lines of each converter are connected together at the load, with current sense resistor R SENSE inserted in each negative return line. Another resistor, R , is also inserted in each positive remote sense line. ADJ The differential share bus terminals (SHARE+ and SHARE−) of each UC3902 are connected together respectively, and the SHARE− node is also connected to the system ground. A typical application is illustrated in Figure 1. The load share controller design can be executed by following the next few steps: Step 1. V R (cid:2) SHARE(max) SENSE A (cid:3)I CSA O(max) (1) (cid:2) where A is 40, the gain of the current sense amplifier CSA At full load, the voltage drop across the R resistor is I × R . Taking into account the gain of the SENSE O(max) SENSE current sense amplifier, the voltage at full load on the current share bus, A (cid:3)I V (cid:2) CSA O(max) SHARE(max) R SENSE (2) This voltage must stay 1.5-V below V or below 10 V whichever is smaller. V represents an upper limit CC SHARE but the designer should select the full scale share bus voltage keeping in mind that every volt on the load share bus increases the master controller’s supply current by approximately 100 μA times the number of slave units connected parallel. Step 2. V R (cid:2) ADJ(max) G I ADJ(max) (3) Care must be taken to ensure that I is low enough so that both the drive current and power dissipation ADJ(max) are within the device’s capability. For most applications, an I current between 5 mA and 10 mA is ADJ(max) acceptable. In a typical application, a 360-Ω R resistor from the ADJR pin to ground sets I to G ADJ(max) approximately 5 mA. Step 3. (cid:5) (cid:6) (cid:2)V (cid:4) I (cid:3)R O(max) O(max) SENSE R (cid:2) ADJ I ADJ(max) (4) R must be low enough to not affect the normal operation of the converter’s voltage feedback loop. Typical ADJ R values are between 20 Ω to100 Ω depending on V , ΔV and the selected I value. ADJ O O(max) ADJ(max) Step 4. g R R (cid:5) (cid:6) C (cid:2) M (cid:3) ADJ(cid:3) SENSE(cid:3)A (cid:3)A f C 2(cid:3)(cid:3)f R R CSA PWR C C G LOAD (5) 6 www.ti.com

UC2902 UC3902 SLUS232E − DECEMBER 19, 2002 − REVISED JULY 2011 The share loop compensation capacitor, C is calculated to produce the desired share loop unity gain crossover C frequency, f . The share loop error amplifier’s transconductance, g is nominally 4.5 ms. The values of the C M resistors are already known. Typically, f is set to at least one order of magnitude below the converter’s closed C loop bandwidth. The load share circuit is primarily intended to compensate for each converter’s initial output voltage tolerance and temperature drift, not for differences in their transient response. The term A is the PWR(fc) gain of the power supply measured at the desired share loop crossover frequency, f . This gain can be C measured by injecting the measurement signal between the positive output and the positive sense terminal of the power supply. Step 5. R (cid:2) 1 C 2(cid:3)(cid:3)f (cid:3)C C C (6) A resistor in series with C is required to boost the phase margin of the load share loop. The zero is placed at C the load share loop crossover frequency, f . C When the system is powered up, the converter with the highest output voltage tends to source the most current and take control of the share bus. The other converters increase their output voltages until their output currents are proportional to the share bus voltage minus 50 mV. The converter which in functioning as the master may change due to warmup drift and differences in load and line transient response of each converter. ADDITIONAL INFORMATION Please refer to the following topic for additional application information. 1. Application Note U−163, (TI Literature No. SLUA128) The UC3902 Load Share Controller and Its Performance in Distributed Power Systems by Laszlo Balogh www.ti.com 7

PACKAGE MATERIALS INFORMATION www.ti.com 28-Jul-2011 TAPE AND REEL INFORMATION *Alldimensionsarenominal Device Package Package Pins SPQ Reel Reel A0 B0 K0 P1 W Pin1 Type Drawing Diameter Width (mm) (mm) (mm) (mm) (mm) Quadrant (mm) W1(mm) UC2902DTR SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1 UC3902DTR SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1 PackMaterials-Page1

PACKAGE MATERIALS INFORMATION www.ti.com 28-Jul-2011 *Alldimensionsarenominal Device PackageType PackageDrawing Pins SPQ Length(mm) Width(mm) Height(mm) UC2902DTR SOIC D 8 2500 340.5 338.1 20.6 UC3902DTR SOIC D 8 2500 340.5 338.1 20.6 PackMaterials-Page2

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